Validates the header for field order, additional and missing fields. Raises an error if the header deviates in any of these points.
Example
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[
[
"expectheader",
{
"subtable": null,
"expected": [
"field_1",
"field_2"
],
"_comment": null
}
]
]param str subtable: Name a subtable in which output will be stored (will create subtable where necessary).
param list expected: Columns in expected order.
param str comment: A comment that will appear in the Transformation UI.
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